Portable elevator.



PATENTED JUNE 7, 1904.-

M. BRADFIELD.

PORTABLE ELEVATOR. APPLICATION FILED MAR. 24, aos

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M. BRADFIELD. PORTABLE ELEVATOR.

'AYPLIOATIOITIILE]? MAR. 24, 1903.

N0 MODEL.

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UNITED STATES Patented June '7, 1904;.

PATENT OFFICE.

PORTABLE ELEVATOR.

SPECIFICATION forming part of Letters Patent No. 761,941, dated June 7, 1904. Application filcd'Marcll 24, 1903. Serial No. 149,332. (No model.)

To all whom it may concern;

Be'it known that I, MASON BRADFIELD, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented certain new and useful Improvements in Portable Elevators; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to elevators, and particularly to elevators constr ucted to be transported from place to place; and some of the objects of the invention are to provide a device of this character Which will be simple'and cheap in construction and at the same time efiicient for the purpose intended.

A further object of the invention is to pro- .Vide an elevator having elevating-screws operated by gears and engaging threaded hangers or brackets upon the elevator-platform.

Still another object of the invention is to provide an elevator having only two uprights,

with which are connected elevating-screws en-- gaging the platform in such a manner that the elevation of the latter braces and binds said uprights.

Furthermore, an object of this invention is to provide an elevator having movable wings or extensions constructed to facilitate the movement of articles upon the elevator when the extensions are lowered and retain such articles upon the elevator when the-extensions are raised.

\Vith these and other objects in view the invention consists, essentially, of the construction, combination, and arrangement of parts,

substantially as more fully described in the following specification and illustratedin the accompanying drawings, forming. part of this applicat on, 1n which- Figure 1 is a sectional view, partially in elevation, taken on line 1 l of Fig. 3. Fig. 2 is a sectional view'taken on line 2 2 of Fig. 1, parts being shown in elevation. Fig. 3 top plan view showing the upper portion of the elevator cut away on line 3 3 of Fig. 2. Fig. 1 is an enlarged detail sectional view on is a' line 4: 4 of Fig. 3, parts being broken away and parts being omitted to facilitate illustration; and Fig. 5 is an enlarged sectional view of the driving mechanism.

Similar characters of reference designate corresponding parts throughout the several views.

Referring to the drawings, the reference character 1 designates beams or timbers, which are preferably cut away intermediate of their length, as at 2, for the purpose hereinafter explained, and suitably connected with the extremities of the beams or timbers 1 are end beams or timbers 3, with which are suitably connected uprights 4, provided with metallic bands 5, carrying eyes or loops 6 on diametrically opposite sides thereof to receive the bent extremities of tie-rods 7, having turnbuekles 8 and connected with eyebolts 9 in the side beams or timbers 3 to prevent the lateral movement or displacement of the uprights or standards 1, as will be readily understood.

Formed on or connected with the bands or collars 5 are bearings 10, movably receiving the cylindricalextremities 11 of the elevatingscrews 12, the opposite ends whereof are preferably provided with a conical or other collar 13, below which there is formed a cylindrical bearing-shoulder portion 14, movably mounted in a bearing 15 of a bracket 16, formed on or connected with the uprights or posts 1, constructed with a channel or recess above said bearing and having a raceway or annular channelto receive antifriction-balls l7, whereon rest the collars 13, to facilitate the rotation of the elevating-screws 12.

J ournaled in the lower ends of the uprights or posts 4 is a drive-shaft 18, carrying beveled gears 19, engaging similar gears 20 on the cylindrical extension or portion 14: of the elevating-screws 12, whereby said screws can be simultaneously rotated through the mediation of a pinion 21 on one end of said drive shaft engaging a gear Wheel 22, suitably mounted in or upon the uprightst and carrying a crank or handle 23, by means of which power is applied to rotate the elevating-screws 12, as will be readily understood by those skilled in the art to which this invention appertains.

A rectangular or other frame 24 has formed thereon or connected therewith drooping or depending supporting-hangers 25, carrying a threaded portion 26, constructed to engage the elevating-screws 12 and having a lip or extension 27 to travel in channel irons or ways 28, secured to the inner face of the uprights 4, substantially as shown. The frame 24 is preferably cut away or rabbeted interiorly, as shown at 29, to receive a platform 30,which, together with said frame, forms the bottom or base of the elevator proper, and movably connected with the ends of the frame 24 are wings or extensions 31, carrying beveled metal shoes 32 and constructed when lowered into the cut-away portions 2 of the beams 1 to facilitate the movement of articles upon the elevator and when elevated to retain such articles thereon. Foot or other levers 33 are preferably mounted in the cut-away portion 34 of the frame 24, and connected with said levers, above and below the fulcrum thereof, are pull-rods 35, connected with spring-actuated bolts or plungers 36, Working in bearings 37 and constructed to retain the wings or extensions 31 in an elevated position, substantially as best illustrated in Figs. 2, 3, and 4 of the drawings.

Short axles 38 may be secured in each end of one of the beams 3 and is provided with suitable wheels 39, and the opposite portion of the elevator structure is supported in small wheels 40, carried by shaft 41, having an intermediate curved portion 42, constructed to support and being connected with the other beam 3 in a movable manner, so that the wheels 40 can be turned in relation to the beam 3 or so as to bring the axle 41 in any position in relation thereto which would be necessary in turning the elevator around and transporting the same from place to place, and a suitable yoke 43 may be connected with the axle 41 and may carry a handle 44, by means of which the elevator can be transported from place to place.

The operation of this invention will be readily understood from the foregoing description when taken in connection with the accompanying drawings and the following explanation thereof. The elevator proper being in the lowest position, the wings of extensions 31 are lowered by forcing the foot-lever 33 into the position shown in dotted lines in Fig. 4, thereby retracting the spring-operated bolts or plungers 36, which retain the wings or extensions 31 in vertical position, as before explained. Then the articles to be elevated are moved up the extensions or wings from either side, and when in position upon the platform 30 the extensions are elevated and the spring-actuated locking bolts or plungers 36 are permitted to enter the recesses in the wings or extensions, thereby holding the same in a vertical position and preventing the accidental discharge of the articles from the elevator during the elevation of the latter.

The elevator proper is raised by power applied to the crank 23 on the gear-wheel 22, meshing with the pinion 21 on the drive-shaft 18, carrying beveled gears 19, meshing with the similar gears 20 on the screws 12, and the latter by their rotation elevate the hangers carrying the elevator proper, said hangers traveling in the channel irons or guideways 28, substantially as before explained.

It is not desired to confine this invention to the specific construction, combination, and arrangement of parts herein shown and described, and the right is reserved to make all such changes in and modifications of the same as come within the spirit and scope of the invention.

I claim 1. An elevator provided with a base portion, uprights thereon, carrying brackets having bearings, screws mounted in said bearings, a traveling portion carrying hangers engaging said screws, wings or extensions on said portion, levers, devices operated thereby for locking the same in an upright position and means for driving said screws.

2. An elevator provided with right and left hand screws, a traveling portion carrying drooping hangers engaging said screws, whereby said portion may be lowered into a plane beneath the extremities of the screws and means for driving the screws.

3. An elevator provided with uprights or standards, right and left hand screws connected only with said standards, a traveling portion carrying drooping hangers engaging said screws, whereby said portion can be lowered beneath the lower extremities of said screws and means for operating the screws.

4. An elevator having uprights carrying brackets, right and left hand screws mounted in said brackets and carrying beveled pinions, a drive-shaft carrying beveled pinions on the outside of the former pinions, a traveling portion having drooping hangers engaging said screws and constructed to extend below the. first-mentioned pinions when said portion is lowered and means for operating said shaft.

5. An elevator provided with uprights carrying recessed brackets, right and left hand screws mounted therein and carrying pinions, a driven shaft having pinions mounted outside of the first pinions, means for driving said shaft, a traveling portion having drooping hangers engaging said screws and extending therebeyond into the recesses of said brackets, whereby said portion can be lowered beneath the end of the screws and adjacent to the surface supporting the elevator.

6. An elevator provided with uprights or standards having guides or ways, brackets upon the lower ends of said standards having recesses communicating with said ways, right and left hand screws mounted in said brackets and connected by collars with the free ends of said standards, pinions on said screws below said brackets, a driven shaft carrying pinions on the outside of the first pinions, means for driving said shaft and a traveling portion carrying hangers engaging said screws and having extensions constructed to travel in said ways and recesses, whereby said traveling portion can be unloaded at the extreme ends of said screws.

7. An elevator provided with uprights, brackets thereon, each having a bearing and an extension, screws mounted in said bearings, and carrying pinions below said bearings, a traveling portion having hangers en- 

